I'm not sure what the question is here? If you're asking which is better/worse (between paying for two places at once or having nowhere to live for a few weeks), it's better to have somewhere to go than nowhere; things you might want to consider:
- if you do take the full year, check your contract, you might be able to sublet the room and then you'd only be paying for the place you're actually living.
- if you have friends in the area, you could see if they'd be able to accommodate you for some time over summer?